* {
}
.main-content {
  margin-bottom: 100px;
}
.code {
  background-color: antiquewhite;
  border: solid lightgray 1px;
  padding: 6px;
  margin: 0;
}

a:link {color: red}		/* 未访问的链接 */
a:visited {color: green}	/* 已访问的链接 */
a:hover {color: blue}	/* 鼠标移动到链接上 */
a:active {color: #000}	/* 选定的链接 */

.code-show {
  display: block;
  background-color: beige;
  border: solid lightgray 1px;
  margin: 0;
  padding: 0;
}

.thover:hover{
  cursor:pointer;
  background-color: gainsboro;
}

.txx:first-letter {
  font-size: xx-large;
}
